ocp-249

QUESTION NO: 249

What does the minimize load database parameter mean when backing up a database?

A. RMAN will attempt to make the backup run as fast as possible without any IO limitations.

B. RMAN will automatically restrict the number of channels in use to one.

C. RMAN will spread the backup IO over the total duration stated in the backup command.

D. RMAN will skip any datafile that currently is involved in an IO operation. RMAN will retry backing up the

datafile later and an error will be raised at the end of the backup if the datafile cannot be backed up.

E. Datafiles will be backed up; those having the lowest current number of IO operations will be backed up

first.

Answer: C

RMAN will attempt to spread the overall IO over the total stated duration of the backup listed in the

duration parameter. This will have the effect of limiting the overall load on the database and reducing the

performance impacts of the backup.

If you use the duration minimize load parameter when performing a backup, then you will be indicating to

Oracle that you want it to reduce the load that the backup has on the database as a whole. When

minimize load is used, Oracle will try to spread the backup over the entire time identified in the duration

parameter. This will result in slower backup times but improved overall database performance.

当备份数据库时，什么是最小化装载数据库参数意思？

C.RMAN会分散备份IO到备份命令规定的全部持续时间。

RMAN将尝试分散全体IO到全部规定的 持续时间参数中 列出的备份持续时间。这将产生的效果是限制了整个数据库的负载和减少备份的性能影响。

进行备份时如果您使用的持续时间减少负载参数，那么你会被指示到Oracle，

你想让它降低备份对作为一个整体的数据库的负载时，尽量减少负载，甲骨文将尽量分散整个时间中确定的持续时间参数的备份。

这将导致较慢的备份时间，但改进的数据库的整体性能.